l1 = ['alex','WuSir',[100,'TaiBai']]
l1[1] = l1[1].upper()
print(l1)'''将WuSir改成大写'''
l1[2].append('日天')
print(l1)'''在[100.'TaiBai']后面增加一个日天'''
l1[2][1] = l1[2][1].upper()
print(l1)'''将'TaiBai’变成大写'''